US20160190157A1 - Pixel structure and manufacturing method thereof - Google Patents
Pixel structure and manufacturing method thereof Download PDFInfo
- Publication number
- US20160190157A1 US20160190157A1 US14/417,514 US201514417514A US2016190157A1 US 20160190157 A1 US20160190157 A1 US 20160190157A1 US 201514417514 A US201514417514 A US 201514417514A US 2016190157 A1 US2016190157 A1 US 2016190157A1
- Authority
- US
- United States
- Prior art keywords
- annular
- circular drain
- tft
- layer
- semiconductor layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- 239000010410 layer Substances 0.000 claims abstract description 126
- 239000004065 semiconductor Substances 0.000 claims abstract description 58
- 239000011241 protective layer Substances 0.000 claims abstract description 30
- 239000000758 substrate Substances 0.000 claims abstract description 19
- 238000009413 insulation Methods 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 11
- 238000000576 coating method Methods 0.000 claims description 3
- 238000000059 patterning Methods 0.000 claims description 3
- 230000002708 enhancing effect Effects 0.000 description 6
- 229910021417 amorphous silicon Inorganic materials 0.000 description 4
- 239000004973 liquid crystal related substance Substances 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier
- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body
- H01L27/1214—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
- H01L27/124—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs with a particular composition, shape or layout of the wiring layers specially adapted to the circuit arrangement, e.g. scanning lines in LCD pixel circuits
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier
- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body
- H01L27/1214—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
- H01L27/1222—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs with a particular composition, shape or crystalline structure of the active layer
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier
- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body
- H01L27/1214—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
- H01L27/1248—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs with a particular composition or shape of the interlayer dielectric specially adapted to the circuit arrangement
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier
- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body
- H01L27/1214—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
- H01L27/1259—Multistep manufacturing methods
- H01L27/1262—Multistep manufacturing methods with a particular formation, treatment or coating of the substrate
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier
- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body
- H01L27/1214—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
- H01L27/1259—Multistep manufacturing methods
- H01L27/127—Multistep manufacturing methods with a particular formation, treatment or patterning of the active layer specially adapted to the circuit arrangement
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
- H01L29/41—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions
- H01L29/417—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions carrying the current to be rectified, amplified or switched
- H01L29/41725—Source or drain electrodes for field effect devices
- H01L29/41733—Source or drain electrodes for field effect devices for thin film transistors with insulated gate
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
- H01L29/41—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions
- H01L29/417—Electrodes ; Multistep manufacturing processes therefor characterised by their shape, relative sizes or dispositions carrying the current to be rectified, amplified or switched
- H01L29/41725—Source or drain electrodes for field effect devices
- H01L29/41758—Source or drain electrodes for field effect devices for lateral devices with structured layout for source or drain region, i.e. the source or drain region having cellular, interdigitated or ring structure or being curved or angular
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/66007—Multistep manufacturing processes
- H01L29/66075—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials
- H01L29/66227—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials the devices being controllable only by the electric current supplied or the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched, e.g. three-terminal devices
- H01L29/66409—Unipolar field-effect transistors
- H01L29/66477—Unipolar field-effect transistors with an insulated gate, i.e. MISFET
- H01L29/66742—Thin film unipolar transistors
- H01L29/6675—Amorphous silicon or polysilicon transistors
- H01L29/66765—Lateral single gate single channel transistors with inverted structure, i.e. the channel layer is formed after the gate
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/786—Thin film transistors, i.e. transistors with a channel being at least partly a thin film
- H01L29/78606—Thin film transistors, i.e. transistors with a channel being at least partly a thin film with supplementary region or layer in the thin film or in the insulated bulk substrate supporting it for controlling or increasing the safety of the device
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/786—Thin film transistors, i.e. transistors with a channel being at least partly a thin film
- H01L29/78651—Silicon transistors
- H01L29/7866—Non-monocrystalline silicon transistors
- H01L29/78663—Amorphous silicon transistors
- H01L29/78669—Amorphous silicon transistors with inverted-type structure, e.g. with bottom gate
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/786—Thin film transistors, i.e. transistors with a channel being at least partly a thin film
- H01L29/78696—Thin film transistors, i.e. transistors with a channel being at least partly a thin film characterised by the structure of the channel, e.g. multichannel, transverse or longitudinal shape, length or width, doping structure, or the overlap or alignment between the channel and the gate, the source or the drain, or the contacting structure of the channel
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Liquid Crystal (AREA)
Abstract
A TFT-LCD pixel structure and a manufacturing method thereof are provided. The TFT-LCD pixel structure includes a gate line, a TFT switch and a pixel electrode that are formed on a substrate. The TFT switch includes a circular drain, an annular semiconductor layer, an annular source, and a protective layer. The circular drain is insulatively formed on the gate line. The annular semiconductor layer is disposed around the circular drain. The annular source is disposed around the annular semiconductor layer. The protective layer is formed on the circular drain, the annular semiconductor layer, and the annular source, in which the protective layer defines a via hole on the circular drain, and the pixel electrode is electrically coupled to the circular drain through the via hole. The TFT-LCD pixel structure of the present invention can enhance aperture ratio and increase charging capability of the pixel electrode.
Description
- The present invention relates to a liquid crystal display (LCD) technology, and in particular to a thin film transistor liquid crystal display (TFT-LCD) pixel structure and a manufacturing method thereof.
- With continuous advancement in LCD technology, the number of pixels on a thin-film transistor (TFT) array substrate gradually increases. That is to say, pixels per inch (PPI) on the display panel also simultaneously increases. Therefore, the number of the TFTs that control brightness of every pixel also goes on increasing.
- However, under the same area, more and more TFT switches and a plurality of gate lines and data lines need to be disposed thereon, such that an aperture ratio of the liquid crystal panel gradually decreases. In order to increase the aperture ratio, the TFT switches are manufactured to be smaller. This would cause charging capability of pixel electrodes to be put to the test.
FIG. 1 is a schematic sectional view illustrating a conventional TFT-LCD pixel structure. As shown inFIG. 1 , aTFT switch 10 includes agate 11, asource 12 coupled to a data line, and adrain 13 coupled to apixel electrode 15. A protective layer (abbreviated to OC (Over Coat) layer 17) with a predetermined thickness has to be disposed on theTFT switch 10. An electrical connection between thepixel electrode 15 and thedrain 13 is realized through avia hole 19. However, thedrain 13 of the reducedTFT switch 10 is also reduced, thus making a connecting region of thepixel electrode 15 and thedrain 13 also simultaneously reduced. This will affect conductivity of thepixel electrode 15 and lower the charging capability of thepixel electrode 15. Meanwhile, since theOC layer 17 is too big, thevia hole 19 is larger. This will hinder the improvement of the aperture ratio of the pixel. - An objective of the present invention is to provide a TFT-LCD pixel structure, which disposes the source and drain of a TFT switch on a gate line for enhancing the aperture ratio. In addition, the present invention designs the drain to be circular and designs the source to be an annulus around the drain, so that a contact area between a pixel electrode and the drain increases, so as to enhance charging capability of the pixel electrode.
- Another objective of the present invention is to provide a TFT-LCD array substrate, which disposes the source and drain of a TFT switch on a gate line for enhancing the aperture ratio. Meanwhile, the drain is designed to be circular, so that the contact area between a pixel electrode and the drain increases, so as to enhance charging capability of the pixel electrode.
- Yet another objective of the present invention is to provide a method for manufacturing a TFT-LCD pixel structure, which provides the specific steps of manufacturing the above-mentioned TFT-LCD pixel structure, thereby solving the drawback in the conventional panel.
- To solve the above-mentioned drawback, a preferred embodiment of the present invention provides a TFT-LCD pixel structure, which includes a gate line, a TFT switch and a pixel electrode formed on a substrate. The TFT switch includes a circular drain, an annular semiconductor layer, an annular source, and a protective layer. The circular drain is insulatively formed on the gate line. The annular semiconductor layer is disposed around the circular drain. The annular source is disposed around the annular semiconductor layer. The protective layer is formed on the circular drain, the annular semiconductor layer, and the annular source, wherein the protective layer defines a via hole on the circular drain, and the pixel electrode is electrically coupled to the circular drain through the via hole.
- In the preferred embodiment of the present invention, a size of the via hole is about equal to a size of the circular drain. Preferably, the via hole is circular.
- In the preferred embodiment the present invention, the gate line has a predetermined width and defines a strip of shaded region. More specifically, the circular drain, the annular semiconductor layer and the annular source are located within the strip of shaded region. In addition, the gate line has a gate insulation layer disposed thereon, and the circular drain, annular semiconductor layer and annular source are formed on the gate insulation layer.
- In the preferred embodiment the present invention, the circular drain defines an opening at a center of the circular drain, and the opening is connected to the via hole.
- In the preferred embodiment the present invention, the annular semiconductor layer includes an annular active layer, a first annular ohmic contact layer, and a second annular ohmic contact layer. The first annular ohmic contact layer is disposed on an inner edge of the annular active layer and utilized to contact the circular drain. The second annular ohmic contact layer is disposed on an outer edge of the annular active layer and utilized to contact the annular source.
- Another preferred embodiment of the present invention provides a TFT-LCD array substrate, which includes a plurality of gate lines, data lines, TFT switches and pixel electrodes formed on the substrate. Each of the TFT switches includes: a circular drain insulatively formed on the gate line; an annular semiconductor layer disposed around the circular drain; an annular source disposed around the annular semiconductor layer; and a protective layer formed on the circular drain, the annular semiconductor layer and the annular source, wherein the protective layer defines a via hole on the circular drain, and the pixel electrode is electrically coupled to the circular drain through the via hole.
- In the preferred embodiment of the present invention, the data line is coupled to an outer edge of the annular source.
- Similarly, to solve the above-mentioned drawback, yet another preferred embodiment of the present invention provides a method for manufacturing a TFT-LCD pixel structure, which includes the steps of: forming a gate line on a substrate; forming a gate insulation layer on the gate line; forming a circular drain and an annular source disposed around the circular drain on the gate insulation layer by a photo-mask process; forming an annular semiconductor layer located between the circular drain and the annular source on the gate insulation layer; forming a protective layer located on the circular drain, the annular semiconductor layer and the annular source, wherein the protective layer defines a via hole on the circular drain; and forming a pixel electrode on the protective layer, wherein the pixel electrode is electrically coupled to the circular drain through the via hole.
- In the preferred embodiment the present invention, the step of forming the annular semiconductor layer includes: forming an ohmic contact layer by a coating process; patterning the ohmic contact layer to form a first annular ohmic contact layer that contacts an outer edge of the circular drain and a second annular ohmic contact layer that contacts an inner edge of the annular source; and forming an annular active layer located between the first annular ohmic contact layer and the second annular ohmic contact layer.
- In comparison with the prior art, the present invention arranges the source, drain and semiconductor layer on the same plane, and the source, drain and semiconductor layer of the TFT switch appear a design of concentric circles. Then the circular drain, annular semiconductor layer and annular source of the present invention are disposed on the gate line, and the via hole is directly made above the circular drain for enhancing the aperture ratio. In addition, the circular drain and the annular source of the present invention increases the area of a conduction channel, thereby enhancing charging capability of the pixel electrode.
- It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.
-
FIG. 1 is a schematic sectional view illustrating a conventional TFT-LCD pixel structure; -
FIG. 2 is a partial top view schematically illustrating a TFT-LCD pixel structure according to a preferred embodiment of the present invention; -
FIG. 3 is a sectional view along a dashed line A-A ofFIG. 2 ; -
FIG. 4 is a partial sectional view schematically illustrating a TFT-LCD pixel structure according to a preferred embodiment of the present invention; -
FIG. 5 is a partial sectional view illustrating another embodiment; and -
FIG. 6 is a flow chart illustrating a method for manufacturing the TFT-LCD pixel structure according to a preferred embodiment of the present invention. - Descriptions of the following embodiments refer to attached drawings which are utilized to exemplify specific embodiments.
- Referring to
FIG. 2 toFIG. 4 ,FIG. 2 is a partial top view schematically illustrating a TFT-LCD pixel structure according to a preferred embodiment of the present invention;FIG. 3 is a sectional view along a dashed line A-A ofFIG. 2 ; andFIG. 4 is a partial sectional view schematically illustrating a TFT-LCD pixel structure according to a preferred embodiment of the present invention. It should be noted that the above-mentioned drawings are just for explanation, and they are not depicted in real proportion. - As shown in the drawing, the TFT-LCD pixel structure of the embodiment includes a
gate line 220, aTFT switch 250, and apixel electrode 270 which are formed on asubstrate 210. As shown inFIG. 2 , theTFT switch 250 of the embodiment includes acircular drain 252, anannular semiconductor layer 260, anannular source 254, and aprotective layer 280. - As shown in
FIG. 3 , thecircular drain 252 is insulatively formed on thegate line 220. Specifically, thegate line 220 has a gate insulation (GI)layer 230 that is disposed thereon, and thecircular drain 252 is formed on thegate insulation layer 230. - As shown in
FIG. 2 andFIG. 3 , theannular semiconductor layer 260 is disposed around thecircular drain 252 and contacts an outer edge of thecircular drain 252. In addition, theannular source 254 is disposed around theannular semiconductor layer 260 and contacts an outer edge of theannular semiconductor layer 260. Specifically, theannular semiconductor layer 260 is utilized as a conduction channel of thecircular drain 252 and theannular source 254. - In the embodiment, the
circular drain 252, theannular semiconductor layer 260, and theannular source 254 are disposed on the same plane. That is to say, thecircular drain 252, theannular semiconductor layer 260, and theannular source 254 have the same thickness. It is worth mentioning that thecircular drain 252, theannular semiconductor layer 260, and theannular source 254 appear a structure of concentric circles, and the center of the concentric circles is positioned at the center of thecircular drain 252. However, the present invention does not limit the structure of concentric circles, and other structures such as ellipses, rectangles and so on are also within the scope of the present invention. More specifically, the drain and source may be irregularly shaped, so as to enlarge the contact area of the semiconductor layer between two electrodes, thereby increasing charging capability. - As shown in
FIG. 2 andFIG. 3 , furthermore, theannular semiconductor layer 260 includes an annularactive layer 261, a first annularohmic contact layer 262, and a second annular ohmic contact layer (N+ doped amorphous silicon) 264. Preferably, the annularactive layer 261 is made of amorphous silicon (a-Si), and the first annularohmic contact layer 262 and the second annularohmic contact layer 264 are made of n+ a-Si. The first annularohmic contact layer 262 is disposed on an inner edge of the annularactive layer 261 and utilized to contact thecircular drain 252. The second annularohmic contact layer 264 is disposed on an outer edge of the annularactive layer 261 and utilized to contact theannular source 254. - As shown in
FIG. 2 , the gate line has a predetermined width W and defines a strip of shaded region S. More specifically, thecircular drain 252, theannular semiconductor layer 260 and theannular source 254 are located within the strip of shaded region S. In addition, thegate line 220 has agate insulation layer 230 disposed thereon, and thecircular drain 252, theannular semiconductor layer 260, and theannular source 254 are formed on thegate insulation layer 230. Therefore, theTFT switch 250 of the embodiment does not occupy translucent area, thereby maximizing the aperture ratio of the pixel. - As shown in
FIG. 4 , theprotective layer 280 is formed on thecircular drain 252, theannular semiconductor layer 260, and theannular source 254, Theprotective layer 280 herein defines a viahole 282 on thecircular drain 252, and thepixel electrode 270 is electrically coupled to thecircular drain 252 through the viahole 282. It is worth mentioning that there is apassivation layer 284 that is disposed between theprotective layer 280 as well as thecircular drain 252,annular semiconductor layer 260 andannular source 254. In the embodiment, a size of the viahole 282 is about equal to a size of thecircular drain 252. That is to say, the viahole 282 is circular viewed from the top. However, in other embodiments, the shapes of the via hole and the drain may be different, as long as thepixel electrode 270 can contact the drain. Moreover, since the viahole 282 is located at the center of theTFT switch 250 and does not extend to a pixel display area outside theTFT switch 250, the aperture ratio can be maximized. - It is worth mentioning that there is a
common electrode 272 that is disposed on theprotective layer 280, and it can work with thepixel electrode 270 to form an In-Plane-Switching (IPS) pixel structure. - Referring to
FIG. 5 ,FIG. 5 is a partial sectional view illustrating another embodiment. In another embodiment, thecircular drain 252 defines anopening 253 at the center of thecircular drain 253, and theopening 253 is connected to the viahole 282, so that the contact area between thepixel electrode 270 on the viahole 282 and thedrain 252 increases, so as to further enhance the charging capability of thepixel electrode 270. Similarly, the present invention does not limit the size and shape of theopening 253, as long as thepixel electrode 270 contacts thedrain 252. - What follows is a detail of a TFT-LCD array substrate that includes the above-mentioned TFT-LCD pixel structure. Referring to
FIG. 2 toFIG. 4 , the TFT-LCD array substrate of the embodiment includes a plurality ofgate lines 220,data lines 225, TFT switches 250, andpixel electrodes 270. - Similarly, each of TFT switches 250 includes a
circular drain 252, anannular semiconductor layer 260, anannular source 254, and aprotective layer 280. Thecircular drain 252 is insulatively formed on thegate line 220. Theannular semiconductor layer 260 is disposed around thecircular drain 252. Theannular source 250 is disposed around theannular semiconductor layer 260. Theprotective layer 280 is formed on thecircular drain 252, theannular semiconductor layer 260 and theannular source 254. Theprotective layer 280 herein defines a viahole 282 on thecircular drain 252, and thepixel electrode 270 is electrically coupled to thecircular drain 252 through the viahole 282. It is worth mentioning that thedata line 225 of the embodiment is coupled to an outer edge of theannular source 254. - What follows is a detail of a method for manufacturing the TFT-LCD pixel structure of the embodiment. Referring to
FIG. 6 andFIG. 2 toFIG. 4 ,FIG. 6 is a flow chart illustrating a method for manufacturing the TFT-LCD pixel structure according to a preferred embodiment of the present invention. The method for manufacturing the TFT-LCD pixel structure of the embodiment begins with step S10. - In step S10, the
gate line 220 is formed on thesubstrate 210, and then execution resumes at step S20. In step S20, thegate insulation layer 230 is formed on thegate line 220, and then execution resumes at step S30. The step is well-known to a person skilled in the art, so no further detail will be provided herein. - In step S30, the
circular drain 252 and theannular source 252 that is disposed around thecircular drain 252 are formed on thegate insulation layer 230 by a photo-mask process, and then execution resumes at step S40. - In step S40, the
annular semiconductor layer 260 that is located 254 between thecircular drain 252 and theannular source 254 is formed on thegate insulation layer 260, and then execution resumes at step S50. - In step S50, the
protective layer 280 that is located on thecircular drain 252, theannular semiconductor layer 260 and theannular source 254 is formed, in which theprotective layer 280 defines the viahole 282 on thecircular drain 252, and then execution resumes at step S60. - In step S60, the
pixel electrode 270 is formed on theprotective layer 280, in which thepixel electrode 270 is electrically coupled to thecircular drain 252 through the viahole 282. - Furthermore, as shown in
FIG. 2 , the step of forming theannular semiconductor layer 260 in step S40 specifically includes: forming an ohmic contact layer by a coating process; patterning the ohmic contact layer to form the first annularohmic contact layer 262 that contacts the outer edge of thecircular drain 252 and the second annularohmic contact layer 264 that contacts the inner edge of theannular source 254; and forming the annularactive layer 261 located between the first annularohmic contact layer 262 and the second annularohmic contact layer 264. - In summary, the present invention arranges the source, drain and semiconductor layer on the same plane, and the source, drain and semiconductor layer of the
TFT switch 250 appear the design of the concentric circles. Then thecircular drain 252,annular semiconductor layer 260 andannular source 254 of the present invention are disposed on thegate line 220, thereby enhancing the aperture ratio. In addition, thecircular drain 252 and theannular source 254 of the present invention increase the area of the conduction channel, thereby enhancing the charging capability of thepixel electrode 270. - While the preferred embodiments of the present invention have been illustrated and described in detail, various modifications and alterations can be made by persons skilled in this art. The embodiment of the present invention is therefore described in an illustrative but not restrictive sense. It is intended that the present invention should not be limited to the particular forms as illustrated, and that all modifications and alterations which maintain the spirit and realm of the present invention are within the scope as defined in the appended claims.
Claims (15)
1. A TFT-LCD array substrate, comprising a plurality of gate lines, data lines, TFT switches and pixel electrodes formed on the substrate, each of the TFT switches comprising:
a circular drain insulatively formed on the gate line;
an annular semiconductor layer disposed around the circular drain;
an annular source disposed around the annular semiconductor layer, wherein the data line is coupled to an outer edge of the annular source; and
a protective layer formed on the circular drain, the annular semiconductor layer and the annular source, wherein the protective layer defines a via hole on the circular drain, and the pixel electrode is electrically coupled to the circular drain through the via hole.
2. The TFT-LCD array substrate according to claim 1 , wherein a size of the via hole is about equal to a size of the circular drain.
3. The TFT-LCD array substrate according to claim 1 , wherein the gate line has a predetermined width and defines a strip of shaded region.
4. The TFT-LCD array substrate according to claim 3 , wherein the circular drain, the annular semiconductor layer and the annular source are located within the strip of shaded region.
5. The TFT-LCD array substrate according to claim 1 , wherein the annular semiconductor layer comprises:
an annular active layer;
a first annular ohmic contact layer, disposed on an inner edge of the annular active layer, utilized to contact the circular drain; and
a second annular ohmic contact layer, disposed on an outer edge of the annular active layer, utilized to contact the annular source.
6. A TFT-LCD pixel structure, comprising a gate line, a TFT switch and a pixel electrode formed on a substrate, the TFT switch comprising:
a circular drain insulatively formed on the gate line;
an annular semiconductor layer disposed around the circular drain;
an annular source disposed around the annular semiconductor layer; and
a protective layer formed on the circular drain, the annular semiconductor layer and the annular source, wherein the protective layer defines a via hole on the circular drain, and the pixel electrode is electrically coupled to the circular drain through the via hole.
7. The TFT-LCD pixel structure according to claim 6 , wherein a size of the via hole is about equal to a size of the circular drain.
8. The TFT-LCD pixel structure according to claim 7 , wherein the via hole is circular.
9. The TFT-LCD pixel structure according to claim 6 , wherein the gate line has a predetermined width and defines a strip of shaded region.
10. The TFT-LCD pixel structure according to claim 9 , wherein the circular drain, the annular semiconductor layer and the annular source are located within the strip of shaded region.
11. The TFT-LCD pixel structure according to claim 10 , wherein the gate line has a gate insulation layer disposed thereon, and the circular drain, annular semiconductor layer and annular source are formed on the gate insulation layer.
12. The TFT-LCD pixel structure according to claim 6 , wherein the circular drain defines an opening at a center of the circular drain, and the opening is connected to the via hole.
13. The TFT-LCD pixel structure according to claim 6 , wherein the annular semiconductor layer comprises:
an annular active layer;
a first annular ohmic contact layer, disposed on an inner edge of the annular active layer, utilized to contact the circular drain; and
a second annular ohmic contact layer, disposed on an outer edge of the annular active layer, utilized to contact the annular source.
14. A method for manufacturing a TFT-LCD pixel structure, comprising the steps of:
forming a gate line on a substrate;
forming a gate insulation layer on the gate line;
forming a circular drain and an annular source disposed around the circular drain on the gate insulation layer by a photo-mask process;
forming an annular semiconductor layer located between the circular drain and the annular source on the gate insulation layer;
forming a protective layer located on the circular drain, the annular semiconductor layer and the annular source, wherein the protective layer defines a via hole on the circular drain; and
forming a pixel electrode on the protective layer, wherein the pixel electrode is electrically coupled to the circular drain through the via hole.
15. The method according to claim 14 , wherein the step of forming the annular semiconductor layer comprises:
forming an ohmic contact layer by a coating process;
patterning the ohmic contact layer to form a first annular ohmic contact layer that contacts an outer edge of the circular drain and a second annular ohmic contact layer that contacts an inner edge of the annular source; and
forming an annular active layer located between the first annular ohmic contact layer and the second annular ohmic contact layer.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201410853614.4A CN104483793A (en) | 2014-12-30 | 2014-12-30 | TFT-LCD (Thin Film Transistor-Liquid Crystal Display) pixel structure and manufacturing method thereof |
CN201410853614.4 | 2014-12-30 | ||
PCT/CN2015/070273 WO2016106799A1 (en) | 2014-12-30 | 2015-01-07 | Thin film transistor liquid crystal display pixel structure and manufacturing method thereof |
Publications (1)
Publication Number | Publication Date |
---|---|
US20160190157A1 true US20160190157A1 (en) | 2016-06-30 |
Family
ID=56165135
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/417,514 Abandoned US20160190157A1 (en) | 2014-12-30 | 2015-01-07 | Pixel structure and manufacturing method thereof |
Country Status (1)
Country | Link |
---|---|
US (1) | US20160190157A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108336132A (en) * | 2018-01-30 | 2018-07-27 | 武汉华星光电半导体显示技术有限公司 | Low-temperature polysilicon film transistor and preparation method thereof |
CN109473447A (en) * | 2018-10-18 | 2019-03-15 | 武汉华星光电半导体显示技术有限公司 | Array substrate and the display device for using the array substrate |
US10975702B2 (en) | 2018-06-14 | 2021-04-13 | Raytheon Technologies Corporation | Platform cooling arrangement for a gas turbine engine |
US20220415928A1 (en) * | 2018-11-21 | 2022-12-29 | HKC Corporation Limited | Array substrate and display panel |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5414283A (en) * | 1993-11-19 | 1995-05-09 | Ois Optical Imaging Systems, Inc. | TFT with reduced parasitic capacitance |
US6330042B1 (en) * | 1997-09-03 | 2001-12-11 | Lg. Philips Lcd Co., Ltd. | Liquid crystal display and the method of manufacturing the same |
US20050280002A1 (en) * | 2004-06-17 | 2005-12-22 | Tae-Wook Kang | Electroluminescence display device |
CN101174651A (en) * | 2007-12-10 | 2008-05-07 | 友达光电股份有限公司 | Pixel structure, thin-film transistor and production method thereof |
US7514326B2 (en) * | 2005-05-13 | 2009-04-07 | Lg Display Co., Ltd | Organic thin film transistor, display device using the same and method of fabricating the same |
US20130009155A1 (en) * | 2011-07-07 | 2013-01-10 | Shenzhen China Star Optoelectronics Technology Co. | Thin-Film-Transistor Array Substrate and Manufacturing Method Thereof |
CN103762218A (en) * | 2014-01-16 | 2014-04-30 | 北京京东方光电科技有限公司 | Array substrate, manufacturing method thereof and display device |
-
2015
- 2015-01-07 US US14/417,514 patent/US20160190157A1/en not_active Abandoned
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5414283A (en) * | 1993-11-19 | 1995-05-09 | Ois Optical Imaging Systems, Inc. | TFT with reduced parasitic capacitance |
US6330042B1 (en) * | 1997-09-03 | 2001-12-11 | Lg. Philips Lcd Co., Ltd. | Liquid crystal display and the method of manufacturing the same |
US20050280002A1 (en) * | 2004-06-17 | 2005-12-22 | Tae-Wook Kang | Electroluminescence display device |
US7514326B2 (en) * | 2005-05-13 | 2009-04-07 | Lg Display Co., Ltd | Organic thin film transistor, display device using the same and method of fabricating the same |
CN101174651A (en) * | 2007-12-10 | 2008-05-07 | 友达光电股份有限公司 | Pixel structure, thin-film transistor and production method thereof |
US20130009155A1 (en) * | 2011-07-07 | 2013-01-10 | Shenzhen China Star Optoelectronics Technology Co. | Thin-Film-Transistor Array Substrate and Manufacturing Method Thereof |
CN103762218A (en) * | 2014-01-16 | 2014-04-30 | 北京京东方光电科技有限公司 | Array substrate, manufacturing method thereof and display device |
US20160027807A1 (en) * | 2014-01-16 | 2016-01-28 | Boe Technology Group Co., Ltd. | Array substrate and manufacturing method thereof, display device, thin-film transistor (tft) and manufacturing method thereof |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108336132A (en) * | 2018-01-30 | 2018-07-27 | 武汉华星光电半导体显示技术有限公司 | Low-temperature polysilicon film transistor and preparation method thereof |
US10975702B2 (en) | 2018-06-14 | 2021-04-13 | Raytheon Technologies Corporation | Platform cooling arrangement for a gas turbine engine |
CN109473447A (en) * | 2018-10-18 | 2019-03-15 | 武汉华星光电半导体显示技术有限公司 | Array substrate and the display device for using the array substrate |
CN109473447B (en) * | 2018-10-18 | 2021-02-26 | 武汉华星光电半导体显示技术有限公司 | Array substrate and display device using same |
US20220415928A1 (en) * | 2018-11-21 | 2022-12-29 | HKC Corporation Limited | Array substrate and display panel |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US10895774B2 (en) | Array substrate, manufacturing method, display panel and display device | |
US9698174B2 (en) | Array substrate, liquid crystal display panel having the same and method of manufacturing the same | |
WO2018099052A1 (en) | Method for manufacturing array substrate, array substrate and display apparatus | |
US9461074B2 (en) | Motherboard, array substrate and fabrication method thereof, and display device | |
US10288925B2 (en) | Liquid crystal display device and manufacturing method thereof | |
JP5243686B2 (en) | Thin film transistor | |
CN104483793A (en) | TFT-LCD (Thin Film Transistor-Liquid Crystal Display) pixel structure and manufacturing method thereof | |
US11049889B2 (en) | Method for preparing array substrate by stripping first photo-resist layer through wet etching before forming ohm contact layer and active layer | |
US9543324B2 (en) | Array substrate, display device and manufacturing method of the array substrate | |
US10403756B2 (en) | Thin-film transistor (TFT) and manufacturing method thereof, array substrate and manufacturing method thereof, and display device | |
US20170162708A1 (en) | Tft substrates and the manufacturing methods thereof | |
WO2016086531A1 (en) | Array substrate and manufacturing method therefor | |
US11448929B2 (en) | Array substrate with light shielding metal portions and manufacturing method thereof, display device | |
US20180197960A1 (en) | TFT array substrate, manufacturing method thereof, and liquid crystal display apparatus | |
US8502946B2 (en) | Array substrate of fringe field switching mode liquid crystal display panel and method of manufacturing the same | |
US20160190157A1 (en) | Pixel structure and manufacturing method thereof | |
KR20170096007A (en) | Array substrate, display panel, and manufacturing method for array substrate | |
US20170139247A1 (en) | Thin Film Transistor Array Substrate, Manufacturing for the Same, and Liquid Crystal Display Panel Having the Same | |
CN104091831A (en) | Thin film transistor, array substrate and display device | |
WO2016201778A1 (en) | Array substrate and manufacturing method therefor | |
US20160062187A1 (en) | Touch display panel and fabrication method thereof, and display device | |
CN103280197B (en) | A kind of array base palte and display floater | |
CN203932068U (en) | A kind of thin-film transistor, array base palte and display unit | |
US9001298B1 (en) | Pixel structure, display panel and manufacturing method of pixel structure | |
CN107393873B (en) | Manufacturing method of thin film transistor array substrate |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: SHENZHEN CHINA STAR OPTOELECTRONICS TECHNOLOGY CO. Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:TANG, YUEJUN;REEL/FRAME:034814/0903 Effective date: 20150115 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |